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    Steel Balls Standard-USA

    GRADE Ball Dia. variation Deviation from spherical form (U) Surface roughness (U) lot Dia. variation (U) Basic Dia. tolerance (U)
    INCH (U)
    3 .000003 0.08 0.08 0.012 0.13 0.75
    5 .000005 0.13 0.13 0.02 0.25 1.25
    10 .000010 0.25 0.25 0.025 0.5 2.5
    16 .000016 0.4 0.4 0.025 0.8 2.5
    24 .000024 0.6 0.6 0.05 1.2 2.5
    48 .000048 1.2 1.2 0.08 2.4 5
    100 .0001 2.5 2.5 0.125 5 12.5
    200 .0002 5 5 0.2 10 25
    500 .0005 13 13 - 25 50
    1000 .001 25 25 - 50 125
    2000?   50 50 - 100 125

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